1 // RUN: %clang_cc1 %s -verify -fsyntax-only -pedantic 2 3 // This file tests the clang extension which allows initializing the components 4 // of a complex number individually using an initialization list. Basically, 5 // if you have an explicit init list for a complex number that contains two 6 // initializers, this extension kicks in to turn it into component-wise 7 // initialization. 8 // 9 // This extension is useful because there isn't any way to accurately build 10 // a complex number at the moment besides setting the components with 11 // __real__ and __imag__, which is inconvenient and not usable for constants. 12 // (Of course, there are other extensions we could implement that would 13 // allow this, like some sort of __builtin_build_complex.) 14 // 15 // FIXME: It would be a good idea to have a warnings for implicit 16 // real->complex and complex->real conversions; as-is, it's way too easy 17 // to get implicit conversions when they are not intended. 18 19 // Basic testcase 20 _Complex float valid1 = { 1.0f, 2.0f }; // expected-warning {{specifying real and imaginary components is an extension}} 21 22 23 // Struct for nesting tests 24 struct teststruct { _Complex float x; }; 25 26 27 // Random other valid stuff 28 _Complex int valid2 = { 1, 2 }; // expected-warning {{complex integer}} expected-warning {{specifying real and imaginary components is an extension}} 29 struct teststruct valid3 = { { 1.0f, 2.0f} }; // expected-warning {{specifying real and imaginary components is an extension}} 30 _Complex float valid4[2] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}} 31 // FIXME: We need some sort of warning for valid5 32 _Complex float valid5 = {1.0f, 1.0fi}; // expected-warning {{imaginary constants}} expected-warning {{specifying real and imaginary components is an extension}} 33 34 35 // Random invalid stuff 36 struct teststruct invalid1 = { 1, 2 }; // expected-warning {{excess elements}} 37 _Complex float invalid2 = { 1, 2, 3 }; // expected-warning {{excess elements}} 38 _Complex float invalid3 = {}; // expected-error {{scalar initializer cannot be empty}} expected-warning {{GNU empty initializer}} 39 40 41 // Check incomplete array sizing 42 _Complex float sizetest1[] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}} 43 _Complex float sizecheck1[(sizeof(sizetest1) == sizeof(*sizetest1)*2) ? 1 : -1]; 44 _Complex float sizetest2[] = { 1.0f, 1.0f, {1.0f, 1.0f} }; // expected-warning {{specifying real and imaginary components is an extension}} 45 _Complex float sizecheck2[(sizeof(sizetest2) == sizeof(*sizetest2)*3) ? 1 : -1]; 46 47 // Constant-folding with init list. 48 _Complex float x = 2 + (_Complex float) { 1, 2 }; // expected-warning {{specifying real and imaginary components is an extension}} 49
